Screw head



FIG. 1 is a top plan view thereof;

FIG. 2 is a front elevation thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a right-side elevation thereof;

FIG. 5 is a left-side elevation thereof;

FIG. 6 is a rear elevation thereof;

FIG. 7 is a cross section taken along the line 7—7 in FIG. 1; and,

FIG. 8 is an enlarged perspective view.

The broken lines in the drawing show environmental structure and form no part of the claimed design. 

The ornamental design for a screw head, as shown and described. 